Genetic drift operates in
1. Large isolated populations
2. Non-reproductive populations
3. Slow reproductive populations
4. Small isolated population
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In Hardy-Weinberg equation, the frequency of heterozygous individual is represented by
1. 2pq
2. Pq
3. q2
4. p2
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Sickle cell anaemia has not been eliminated from African population as
1. It is controlled by dominant genes
2. It is controlled by recessive genes
3. It is not a fatal disease
4. It provides immunity against malaria
In the famous experiment by Louis Pasteur, the straight and long-necked flasks served :
1. as the experimental setup
2. as a control
3. as a cohort
4. no useful purpose
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In genetic drift, the term “genetic bottleneck” means:
1. reduction in allele frequencies or richness
2. random change in allele frequency by chance alone
3. sudden increase in the number of individuals
4. reproductive isolation of the population
An allele that reduces the fitness of organisms is found to decrease very rapidly in a population. Most likely this allele is:
1. recently mutated
2. rare
3. dominant
4. recessive
The set of all genes, or genetic information, in a unit of evolution is called the :
1. genotype
2. polymorphism
3. multiple allelism
4. gene pool
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Persons with sickle cell trait are resistant to severe malaria. This shows:
1. heterozygote advantage
2. heterosis
3. punctuated equilibrium
4. reverse evolution
A small population experiences a sudden crash in size due to a natural calamity. The biggest threat to the population is:
1. loss of genetic variability
2. tendency towards assortative mating
3. reduced gene flow
4. Hardy - Weinberg disequilibrium
What exactly does the nature act upon when selecting an organism?
1. dominant alleles
2. recessive alleles
3. phenotype
4. combined genotype